Projection-screen



l. LAZARUS. 3 PROJECTION SCREEN.

APPLICATION FILED JULY I8. 1912.

' 1,399,566 Patented Dec. 6, 1921.

FIG/1. FIGQ.

WlTflQSSeS a l Ihreni'or L sm Lazarus UNITED "STATES PATENT OFFICE,

ISAAC names, or nmm, enemm,-Assmnon mornnnamrno. 0. en. re. s. n.

n. 11., or BERLIN, GERMANY.

PROJECTION-SCREEN,

Application filed July 18,

Specification of Letters Patent;

1912. Serial No. 710,329.

' 6mm unnnnrnn rnovrsrons or ran ACT or xenon 3, 1921, 4f sum. I..,1313.

I To all whom it may concern Be it known that I, IsAAo LazAnUs, asubject of the Emperor of Germany, residing at 27, Waldemarstrasse,Berlin, in the German .Empire, have invented certain new and usefulImprovements in Pro ect1on-Screens,j

gor which'I' have filed applications in Great ritain Nos. 28,823 and28,838, dated 21st December, 1911; Germany July 25th, 1911; SwitzerlandMay 25th, 1912; France May 28th, 1912, Belgium May 29th,,1912,) of

which the following is a specification.

The invention has for its object a projece tion screen forcinematographic pro ection andthis projection'screen is intended andsuited for direct-projections as generally 1 used in cinematographicexhibitions.

The essence of the invention resides in the fact that'clear glass beadsare arranged by meansof some suitable adhesive on. a backingor supportof any appropriate opaque material..

,The support 01 5 backing'for a projection screen in, accordance withthe invention may consist of paper, canvas,' cardboard, pasteboard, woodor'the like, but a support of stretched canvas has beenfound particular]suitable for this purpose. i

- pon this support the layer of-glass beads of appropriate granulatlonare arranged di-' rectly by a suitable binding medium such for exampleas Japan lacquer,the beads employed having a diameter of from to-l}millimeters. 1 The size of the beads employed depends more particularlyupon the conditions governin the use of each partic- 'ular-scree'n. Thusor example-screensprm f vided with large beads are better suited for usein large halls and interiors owing to the coarser background which theyprovide while screens provided with beads'of very small diameter aremore suitable for smaller halls.

A The adhesive employed for fixing the glass beads .must be of such akind that it produces a dull efiect upon thesupport and is not liable to"crack even-after thescreen has been in use for a long time. Theadhesive should also present such elasticity that even when the screenis rolled up, as it mustbe during-transport, it is not liable to crack;this is of great importance if the screen is to remain in-g'ood order.

The advantage presented by a screen in novel screen is working costs.

that t the rays-of light falling on to the projection smaller sources oflight than with the projection screens vantage of thisis a considerablesaving of light, and a corresponding reduction in the Another importantadvanhitherto employed. One ad- I tage in the reproduction ofcinematographic pictures is 'that the employment of sources of llghtgiving excessively glaring effects can be avoided which was not alwayspossible when any of the known forms of projection screens wereemployed.

The novel projection screen presents these advantages because with sucha screen the layer of clear glass beads arranged on the mat. opaquesupport acts in such a manner e individual glass beads reflect backscreen almost totally and uniformly in all directions, so that no lightis absorbed by the projection screen.

'As compared withother known projection screens which are also intendedto economize' hght, the novel pro ection screen is characterized on theone h'andby the simplicity-and cheapness of its manufacture and on theother hand by the fact that its backing is of opaque material such asordinary canvas. 1 A. projection screen in ac-- cordance with theinvention is therefore exactly as durable as the projection screenshitherto employed consisting of ordinary canvas, and it is in no way assensitive as a .glass screen. As moreover in a projection screen inaccordance with the invention a metallic layer can be dispensed withwithout in any way impairing its efficacy, its utility cannot beimpaired by such a metallic layer becoming dull as a result of oxidationfor example Aprojection screen embodying the invention is illustrated inthe accompanying drawm 'Tfigure 1 is a front elevation, and

Fig. 2 is a section on the line A-B in v Fi .1. i

'fn the drawing, 6 is the backing or sup frame a and c are the port ofthe projection screen consisting of stretched canvas for examplesupported on a glass beads applied to the packing b. a v a What Iclaimand, desire to securejby Letters Patentof the United States is 1'.A'projection screen for use in connection with cinematograph-and similarexhibitions, comprising an opaque foundation hav- 10* ing its ima'gdisplay surface composed of a layer of glass beads.

2. A projection screen for use in connection with 'cinematograph andsimilar exhibitions, having a non-light-transmitting refiecting surface,and an image display surface thereon of a layer of small juxtaposedspherical transparent bodies.

3. A projection screen comprising a non light-transmitting stretchedfabric having its display surface provided with a layer of glass beads.

4;. A ro'ection screen com risin a nonface. v y 5 A projection screencomprising a'non-' light-transmittingfoundation, a 01 ating of assesseslight-transmitting foundation having a layer of clear glass beads on itsimage display sur- Japan lacquer and a layer of glass beads adheringtosaid lacquer. '6.

progectlon 'scree'i comprising anonlight-transm'itting fabric, a coatingofJa'pan lacquer thereon and a layer of glass beadsadhering thereto.

7 A projection screen, comprising a nonli ht-transmitting foundationfabric coated Wlth Japan lacquer to which adheres a layer-

